package chapter04.Example17;

class  Animal {
    public void shout(){
        System.out.println("动物叫");
    }
}
class Dog extends Animal {
    public void shout(){
        System.out.println("汪汪");
    }
    public void eat(){
        System.out.println("吃骨头");
    }
}

public class Example17 {
    public static void main(String[] args) {
        Animal a1 = new Dog();
        System.out.println("Animal a1 = new Dog():"+ (a1 instanceof Animal));
        System.out.println("Animal a1 = new Dog():"+ (a1 instanceof Dog));
        Animal a2 = new Animal();
        System.out.println("Animal a2 = new Animal():"+ (a2 instanceof Animal));
        System.out.println("Animal a2 = new Animal():"+ (a2 instanceof Dog));
    }
}
